Strange: Twitter Ads On Google

Strange as it is strange for me to see "Ads by Twitter" on a Google search results page, as opposed to "Ads by Google." It is not strange as it is a new thing, because Google has been displayed Twitter ads on Google Real Time Search since November 2010.

But still, it seems awkward to se ads by Twitter on Google's pages. Don't you agree?

Obviously, this is part of the deal Twitter made with Google but still, it seems out of the norm for Google to allow other search ads - in this case, "promote tweets," on Google search results.